Placing a question mark after a phrase does not make it a sensible question capable of being answered. Try, if you can, to string together a coherent sentence explaining what you want to know about the mathematics of investment, providing as much context as possible.
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It really depends on what you are trying to calculate. The most common math application is TVM - Time Value of Money which will allow you to calculate mortgage rates, prepayments, and investment value. Any business calculator will have that function
The mathematics of investment deals with the investment of money, such as bonds, paper bills, etc.
A discrete investment is putting money towards something privately. It will eventually be beneficial in some way or it would not be an investment.
Math
math 7